Chemistry Unit Test

An atom is

• Made of protons, electrons, and neutrons
• Is the basic building block of all matter
• The smallest part of an element that can be identified as that element
• All of these

His periodic table of the elements was ordered by increasing atomic mass.

• Henry Mosely
• Dimitri Mendeleev
• Albert Einstein

Horizontal rows on the periodic table are called _______________

• Groups/Families
• Periods
• Energy Levels

Vertical columns on the periodic table are called

• Groups/Families
• Periods
• Oxidations Numbers

What element is in period 4, group 17

• Fluorine
• Beryllium
• Bromine

What is its atomic #

• 9
• 35
• 79.04

What is its atomic mass

• 19.08
• 35
• 79.904

What is its mass number of its most common isotope?

• 80
• 79
• 19

How many protons in its atom

• 35
• 9
• 79

How many electrons in its neutral atom

• 19
• 79
• 35